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PICList Thread
'Weather station Re wind cal'
1998\02\14@105139 by Youngjs

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For low speed wind sensor calibration try mounting the sensor on a car pulled
by a winch in a borrowed hallway.
Use a stepper motor driven by a stamp or a pic or a pc for controlled pull
speeds.
Build the car out of a piece of wood big enough to hold the sensor and its
signal conditioners.
Use either radio, light, or sound (ultrasonics), or even a trailed wire to get
the signal to the calibrator.
Use a hallway long enough to ramp the speed up to the stable calibration
speed, read the value for that speed, then ramp the speed down to stop.
Run a string from the car, to the winch at one end of the hall, back to a
pulley at the the other end of the hall, to the back of the car so that the
car may be easily reset for multiple calibration runs.
Borrow a hallway in a highschool (befriend the physics teacher) or your church
or lodge/ VFW etc.
This is paraphrased from Dr. Shawn Carlson of Scientific American Amateur
Scientist.

John

1998\02\14@133809 by M Walter

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face
There was a technique for measuring wind speed in Scientific American about
10-15 years back. It involved a ping pong ball on a string. The angle of
the deflection is used as a measure of the wind speed. Since ping pong
balls are very uniform in size and weight, the author was able to give
calibration constants for the system. You might be able to use this as a
tranfer standard to calibrate you PIC wind speed system. 'Couse you need a
day where the wind is constant. E-Mail me if you want more details, and
I'll see if I can find the article.
Mark Walter

1998\02\14@204720 by Steve Baldwin

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> For low speed wind sensor calibration try mounting the sensor on a car
pulled
> by a winch in a borrowed hallway.
> Use a stepper motor driven by a stamp or a pic or a pc for controlled
pull
> speeds.
> Use either radio, light, or sound (ultrasonics), or even a trailed wire
to get
> the signal to the calibrator.

What happened to the KISS principle ?
While a car speedo isn't much use at low speeds, a rev counter is. Keep a
constant RPM in a low gear and time how long between two points.

Steve.

======================================================
 Very funny Scotty.  Now beam down my clothes.
======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680                email: spam_OUTstevebTakeThisOuTspamkcbbs.gen.nz
New Lynn, Auckland           ph  +64 9 820-2221
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======================================================

1998\02\15@101134 by Youngjs

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In a message dated 98-02-14 20:48:12 EST, you write:

<< What happened to the KISS principle ?
While a car speedo isn't much use at low speeds, a rev counter is. Keep a
constant RPM in a low gear and time how long between two points.
 >>
It all depends on how much precision/repeatability you desire.  Even your
method ( a rev counter on a car) violates the KISS principle.  A more KISS
method might use the Beaufort scale which then would not even require the use
of an automobile.
John

1998\02\15@135324 by John Griessen

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face
Using a car is right in line with KISS.  A car is a platform that is
infinitely more thoroughly tested and reliable for its normal purpose.
Using it for a smooth riding constant speed physical platform is the
essence of KISS.  to me, KISS means getting to where you are going by smart
simplifying as well as keeping it crude if that will do.

>It all depends on how much precision/repeatability you desire.  Even your
>method ( a rev counter on a car) violates the KISS principle.  A more KISS
>method might use the Beaufort scale which then would not even require the use
>of an automobile.
>John
>

1998\02\17@094458 by Claudio Rachiele IW0DZG

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If the article is few pages, pls fax it to me. My fax is +39.6.596.65444. TIA

                      Claudio Rachiele IW0DZG

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